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3 years ago

A bar magnet is held in place while another bar magnet is placed near it. The second bar magnet spins around and

Physics

1 answer:

Vinil7 [7]3 years ago

4 0

Answer:

Explanation:

the increase energy stored in thw system is proportional to the decrease in kinetic energy

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In the process of changing a flat tire, a motorist uses ahydraulic jack. She begins by applying a force of 45 N to the inputpist

Verdich [7]

Answer:

3100.05 N

Explanation:

$F_1$ = Force on piston = 45 N

$r_1$ = Radius of piston

$r_2$ = Radius of plunger

$\dfrac{r_2}{r_1}=8.3$

From Pascal's law we have

$\dfrac{F_1}{A_1}=\dfrac{F_2}{A_2}\\\Rightarrow F_2=\dfrac{F_1A_2}{A_1}\\\Rightarrow F_2=\dfrac{F_1\pi r_2^2}{\pi r_1^2}\\\Rightarrow F_2=\dfrac{F_1r_2^2}{r_1^2}\\\Rightarrow F_2=F_1\dfrac{r_2^2}{r_1^2}\\\Rightarrow F_2=45\times 8.3^2\\\Rightarrow F_2=3100.05\ N$

The force is 3100.05 N

3 0

3 years ago

A flat square plate of side 20cm moves over other similar plate with a thin layer of 0.4cm of a liquid between them with force 1

antiseptic1488 [7]

Answer:

$\mu=0.98\ Pa.s$

Explanation:

Given:

dimension of square plate, $l=0.2\ m$

thickness of fluid layer, $dy=0.004\ m$

force on the fluid due to plate, $F=1\ kgw=1\times 9.8=9.8\ N$

velocity of plate, $du=1\ m.s^{-1}$

<u>Using Newton's law of viscosity:</u>

$\tau=\mu.\frac{du}{dy}$ ..........................................(1)

where:

$\tau=$ shear force on the surface on the fluid

$\mu=$ coefficient of (dynamic) viscosity

Now, shear force:

$\tau=\frac{shear\ force}{area}$

$\tau=\frac{9.8}{0.2\times0.2} \ Pa$

Putting respective values in eq.(1)

$\frac{9.8}{0.2\times0.2}=\mu\times\frac{1}{0.004}$

$\mu=0.98\ Pa.s$

7 0

3 years ago

A surface is bombarded by particles, each of mass small 'm', which have velocity

ale4655 [162]

Answer:

B. 2nmv

Explanation:

Pressure is force over area.

P = F / A

Force is mass times acceleration.

F = ma

Acceleration is change in velocity over change in time.

a = Δv / Δt

Therefore:

F = m Δv / Δt

P = m Δv / (A Δt)

The total mass is nm.

The change in velocity is Δv = v − (-v) = 2v.

A = 1 and Δt = 1.

Plugging in:

P = (nm) (2v) / (1 × 1)

P = 2nmv

8 0

3 years ago

You are considering developing a new food-chopping appliance which uses an Arduino with a touchscreen to control the motor. You

trasher [3.6K]

Answer:

Explanation:

The food chopping appliances in this scenario should adapt use of digital image processing systems to capture the images after the chopping begins. Certain variables can be defined like food particles size, area etc. This will help deciding a threshold for the variable and then the comparator used in the system will(run by real time operating system) compare the threshold size with the digital image size of particles. If the size is found small then the speed of motor should reduce meaning we have chopped the food as per our need. In case the chopping is not done aptly, the same can be enhanced by increasing the speed of motor till the final outcome is reached

4 0

2 years ago

An object travels along a straight, horizontal surface with an initial speed of 2 ms. The position of the object as a function o

pashok25 [27]

Answer:

The options are not provided, so i will answer in a general way.

We know that:

The movement is along a straight horizontal surface, then we have one-dimensional motion.

The speed is 2m/s

We want a graph of position vs time.

Now, remember the relation:

Distance = Speed*Time

Then we can write the position as a function of time as:

P(t) = 2m/s*t + P0

Where t is our variable, that represents time in seconds, and P0 is the position at time t = 0seconds, we can assume that this is zero.

Then the equation is:

P(t) = 2m/s*t

And the graph is something like:

3 0

3 years ago